Pump



O. J. SCHMIDT May L @34uv PUMP Filed May l, 1955 ATTOR N EY ANNEES y Fatenteci it E934 Application May l., 1933, Serial No. 668,861

d Claims.

This invention relates to pumps especially adapted for deep wells and has for the primary object, the provision of an expansion means for lifting the liquid of the Well and which is compressed by pneumatic or similar means actuated by power means to permit successful operation of the pump to be had from the minimum amount of power and to eliminate the use of lifting rods customarily found in deep well pumps.

With these and other obj cts in View this invention consists-in certain ovel features of construction, combination an arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure l is a vertical sectional view illustrating a pump constructed in accordance with my invention.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a similar view taken on the line 3--3 of Figure 1.

Referring in detail to the drawing, the nurneral l indicates a well tube or casing extending from the bottom to the top of the well and has detachably connected to its upper end a pressure `cylinder 2 closed at its upper end by a removable cap 3 and having its lower end in full communication with the interior of the tube 1. An outlet nipple i is in communication with the interior of the cylinder 2 intermediate the ends of the latter and is connected to a check valvel 5 which is in turn connected to a delivery pipe 6. The end of the nipple which is in communication with the interior of the cylinder 2 is preferably barred to prevent the cups 7 of the piston 8 from catching in the nipple during the reciprocation of the piston. However, said barred end of the nipple allows the piston to force liquid outwardly through the nipple by the check valve through the delivery pipe 6, the check valve preventing the return of the liquid from the pipe to the cylinder 2. It is understood that the cylinder 2 is located above the surface of the ground and the stem of the piston slides through the cap 3 and is connected in any suitable manner to the power source for the purpose of reciprocating the piston. The reciprocation of the piston is to develop pressure in the tube 1 and when the cylinder 2 receives liquid from the tube the piston acts to expel said liquid throughvthe delivery pipe 6.

A rest 9 is threaded to the lower end of the gasket 11 seals the lower end of thetulie l.

to the liquid in the well. The upper end of the cylinder is closed by a detachable cap le which 'also forms a seat for an expansion spring 15 of the coil type. A cylinder 16 is threaded to the cap 14 and is in communication with the 55 interior of the cylinder l2 and is of a smaller diameter than the diameter of the cylinder 12 and is surrounded by the spring 15. A plunger 17 of the check valve type is reciprocally mounted in the cylinder 12 and the Stem 18 m thereof is detachably connected to a plunger 19 of the check valve type which is reciprocal- 1y mounted in the cylinder 16. The stem 20 of the plunger 19 extends outwardly of the cylinder 16 and is provided with a conical shaped l@ head 21 to be engaged by a grapple when desiring to remove or replace the cylinders 12 and 16 and their plungers in the tube 1.' A spider 22 is adjustably secured to the stem 20 outwardly of the cylinder 16 and forms a seat for the upper end of the spring l5. The spider 22 carries a cushion 23 to engage the upper end of the cylinder `16 when the plungers are moved into their full downward position. The

plungers 17 and 19 are of the sectional type 35 threaded together and carry cups which frictionally contact with the walls of the cylinders. The plungers have passages therethrough controlled by vball valves so that liquid may pass upwardly beyond the plungers during the reciprocation thereof. A cushion spring 24 is secured to the plunger 17 and is adapted to engage the cap 14 for cushioning the movement of the plunger 17 in an upward direction when said plunger reaches substantially its uppermost'95 position.

In operation, the cylinder 12 extending into the liquid of the well will receive liquid from the well during the upstroke of the plungers caused by the expansionof the spring l5 and 100 the liquid trapped in the cylinder 12 is forced into the cylinder 16 by way of the passage through the plunger 19 andthe liquid trapped in the cylinder 16 is forced upwardly into the tube 1 and into the cylinder 2. The rise of the liq- 105 uid heretofore described in the several cylinders takes place during the upward stroke of the plungers and the piston 8. The downward stroke of' the piston 8 forces the liquid into the discharge pipe 6 until the piston 8 passes the 110 nipple 4 and then further movement of the piston in the downward direction develops a pressure against the liquid in the tube l and in the cylinder 16 which acts upon the plunger 19 in a downward direction, causing thelatter during its downward movement to compress the spring 15 and also move the plunger 17 downwardly unseating the check valve of the latter and allowing the cylinder 12 to replenish with liquid from the well so that on the upstroke of the piston 8 the spring immediately acts to raise the plungers and thereby cause lifting of the liquid. Thus it will be seen that the lifting of the liquid is effectively and economically accomplished through the spring and the compressing o! the latter is easily accomplished by a minimum amount of power applied to the piston 8.

. While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of my invention, as claimed.

Having described the invention, I claim:

1. A pump including a well tube, a cyinder closing the lower end of the tube and in communication with the liquid of the well, a second cylinder in communication with the first cylinder, connected and valved plungers slidable in said cylinders, expansion means for driving the plungers on an upward stroke to lift the liquid into the well tube and means to compress and release said expansion means.

2. A pump including a well tube, a cylinder closing the lower end of the tube and in communication with the liquid of the we1l,: a second cylinder in communication with the rst cylinder, connected and valved plungers slidable in said cylinders, expansion means for driving the plungers on an upward-stroke to lift the liquid into the well tube, a third cylinder connected to the Well tube, outlet means for said third cylinder, and a power driven piston in the third cylinder for expelling liquid therefrom and for developing pressure in the tube and second cylinder for driving the plungers downwardly and compressing said expansion means.

3. A pump including a well tube, a cylinder closing the lower end of the tube and in cornmunication with the liquid of the well, a second cylinder in communication with the first cylinder and of a diameter smaller than the diameter of said rst cylinder, connected and valved plungers slidable in said cylinders, a spring for driving the plungers on their upward stroke to lift the liquid into the well tube, and means to compress and release said spring and plungers.

4. A pump including a well tube, a cylinder closing the lower end of the tube and in communication with the liquid of the well, a second cylinder in communication with the first cylinder and of a diameter smaller than the diameter of said rst cylinder, connected and valved plungers slidable in said cylinders, a spring for driving the plungers on their upward stroke to lift the liquid into the well tube, a third cylinder connected to the well tube, outlet means for the third cylinder, and a power driven piston in the third cylinder for expelling liquid therefrom and for developing and releasing pressure in the tube and second cylinder for driving the plungers downwardly and compressing the spring.

OSCAR J. SCHMIDT. 

